wm8944 Wolfson Microelectronics plc, wm8944 Datasheet

wm8944

Manufacturer Part Number

wm8944

Description

Mono Low-power Codec With Video Buffer

Manufacturer

Wolfson Microelectronics plc

Datasheet

1.WM8944.pdf (7 pages)

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DESCRIPTION

The WM8944 is a highly integrated low power hi-fi CODEC

designed for portable devices such as digital still cameras.

Up to 4 analogue inputs may be connected; a digital

microphone interface is also provided. Flexible output mixing

options support single-ended and differential configurations,

with outputs derived from the digital audio or analogue bypass

paths. Mono line and BTL headphone/speaker output can be

supported.

Flexible digital mixing and powerful DSP functions are available.

Programmable filters and other processes may be applied to

the ADC and DAC signal paths simultaneously. The DSP

functions include notch filters, 5-band EQ, dynamic range

control and the Wolfson ReTune™ feature.

The ReTune

compensate for imperfect characteristics of the housing,

loudspeaker or microphone components in an application. The

ReTune

selective phase (delay) control of specific frequency bands.

The WM8944 is controlled via a I2C or SPI interface. Additional

functions include Auxiliary ADC, Digital beep generator, Video

buffer, programmable GPIO functions, Frequency Locked Loop

(FLL) for flexible clocking support and integrated LDO for low

noise supply regulation.

The WM8944 is supplied in 36-ball W-CSP package, ideal for

portable systems.

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algorithm can provide acoustic cancellation and

feature is a sophisticated digital filter that can

Mono Low-Power CODEC with Video Buffer

http://www.wolfsonmicro.com/enews

FEATURES

•

APPLICATIONS

•

Hi-fi audio CODEC

4 analogue audio inputs

Integrated bias reference for electret microphones

Digital microphone interface

Powerful digital mixing / DSP functions:

Digital beep generator

3 analogue audio outputs

Mono line output

Mono BTL headphone/speaker output driver

I2S digital audio interface - sample rates 8kHz to 48kHz

Frequency Locked Loop (FLL) frequency conversion / filter

Video buffer function

Integrated LDO low-noise voltage regulator

36-ball W-CSP package (2.96 x 3.06 x 0.7mm, 0.5mm pitch)

Digital Still Cameras (DSC)

Multimedia phones

94dB SNR during ADC recording (‘A’ weighted)

98dB SNR during DAC playback (‘A’ weighted)

5-notch filters

5-band equalizer (EQ)

ReTune

Dynamic range control and noise gate

Low-pass/High-pass filters

Direct Form 1 (DF1) programmable digital filter

parametric filter

Product Brief, October 2009, Rev 1.1

WM8944

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